function db_insert($sql){
	global $db_host,$db_user,$db_passwd,$db_name;
	$conn=ADONewConnection('mysql'); //Instancia de ADODB para proveedor MySQL
	$conn->Connect($db_host,$db_user,$db_passwd,$db_name) ; // Connexion a MySQL
	$result=$conn->Execute("SET NAMES UTF8 ;");
	$rs=$conn->Execute($sql); // Ejecutar SQL y devuelve un ADORecordSet
	$ID=$conn->Insert_ID(); //Retorna el ID del registro insertado
	$conn->Close();
	return $ID;
}

http://phplens.com/adodb/

A PHP function to get a Record Set using ADOdb Library.

It takes the (SQL) query as an argument. For INSERT queries. NOTE: A call for a query.

It also need next variables: $dbhost,$dbuser,$dbpasswd,$dbname (data from de bbdd connexion). Can be declared in the document itself.

It returns the Record Set.

It needs the ADOdb Library for php.

db_query PHP function for ddbb queries with ADOdb Library (INSERT queries)

php

PHP